:root {
  color-scheme: light;
  --bg: #F8F8FA;
  --panel: #FFFFFF;
  --panel-2: #EEEDFB;
  --border: #E3E2EC;
  --accent: #4E44F2;
  --accent-dark: #3A31C9;
  --accent-mid: #6A62FF;
  --accent-soft: #7A72FF;
  --text: #121220;
  --muted: #5C5B6E;
  --success: #17A05A;
  --warn: #C98208;
  --error: #D5334A;
  --on-accent: #FFFFFF;
  --clear: transparent;
  --accent-a03: rgba(78,68,242,.03);
  --accent-a05: rgba(78,68,242,.05);
  --accent-a06: rgba(78,68,242,.06);
  --accent-a08: rgba(78,68,242,.08);
  --accent-a10: rgba(78,68,242,.10);
  --accent-a12: rgba(78,68,242,.12);
  --accent-a14: rgba(78,68,242,.14);
  --accent-a18: rgba(78,68,242,.18);
  --accent-a28: rgba(78,68,242,.28);
  --accent-a40: rgba(78,68,242,.40);
  --accent-deep-a45: rgba(58,49,201,.45);
  --ink-a12: rgba(18,18,32,.12);
  --ink-a20: rgba(18,18,32,.20);
  --success-a16: rgba(23,160,90,.16);
  --hi: rgba(255,255,255,.92);
  --hi-soft: rgba(255,255,255,.62);
  --hi-glass: rgba(255,255,255,.30);
  --flag-white: #FFFFFF;
  --flag-sg: #EF3340;
  --flag-us-r: #B22234;
  --flag-us-b: #3C3B6E;
  --flag-jp: #BC002D;
  --flag-hk: #DE2910;
  --flag-fr-b: #0055A4;
  --flag-fr-r: #EF4135;
  --flag-au-b: #012169;
  --flag-au-r: #E4002B;
  --font-display: 'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Microsoft YaHei',system-ui,sans-serif;
  --font-body: 'Inter','Noto Sans SC','PingFang SC','Hiragino Sans','Malgun Gothic','Microsoft YaHei',system-ui,sans-serif;
  --font-mono: 'JetBrains Mono','SFMono-Regular',Consolas,'Liberation Mono',monospace;
  --r-tool: 5px;
  --r-btn: 8px;
  --r-inset: 10px;
  --r-card: 12px;
  --r-win: 14px;
  --r-board: 20px;
  --r-pill: 999px;
  --r-round: 50%;
  --r-seg: 9px;
  --r-seg-item: 7px;
  --gutter: 40px;
  --content-width: 1360px;
  --reading-width: 800px;
  --header-height: 72px;
  --anchor-offset: 88px;
  --toc-offset: 88px;
  --shadow-card: inset 0 1px 0 var(--hi),0 20px 48px -24px var(--accent-a12);
  --ease-ui: .15s;
  --reveal-time: .35s;
}

*,*::before,*::after { box-sizing: border-box; }
html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: var(--anchor-offset);
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: linear-gradient(180deg,var(--accent-a06) 0,var(--accent-a03) 560px,var(--clear) 900px) top/100% 960px no-repeat,var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
[hidden] { display: none !important; }
img { display: block; max-width: 100%; height: auto; }
svg { flex-shrink: 0; }
button,input,select,textarea { font: inherit; }
button { cursor: pointer; }
button,a { -webkit-tap-highlight-color: var(--accent-a10); }
a { color: inherit; text-underline-offset: .2em; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: var(--r-btn); }
h1,h2,h3,h4 { font-family: var(--font-display); color: var(--text); overflow-wrap: break-word; }
h1 { margin: 0 0 24px; font-size: clamp(52px,5vw,68px); font-weight: 900; line-height: 1.1; letter-spacing: -.02em; }
h2 { margin: 0 0 24px; font-size: 36px; font-weight: 900; line-height: 1.2; letter-spacing: -.02em; }
h3 { margin: 0 0 12px; font-size: 22px; line-height: 1.4; font-weight: 750; }
p { margin: 0 0 20px; }
ul,ol { padding-inline-start: 24px; }
pre,code,kbd { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; font-size: .9em; background: var(--panel-2); border-radius: var(--r-tool); padding: .12em .3em; }
pre { max-width: 100%; overflow-x: auto; padding: 24px; border: 1px solid var(--border); border-radius: var(--r-card); background: var(--panel); }
pre code { padding: 0; background: var(--clear); white-space: pre; overflow-wrap: normal; }
hr { border: 0; border-top: 1px solid var(--border); margin-block: 32px; }
.wrap { width: 100%; max-width: var(--content-width); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-top: 72px; padding-bottom: 72px; }
.reading-wrap { max-width: var(--reading-width); margin-inline: auto; min-width: 0; }
.prose { min-width: 0; overflow-wrap: anywhere; }
.prose p,.prose li { line-height: 1.85; }
.prose h2 { margin-top: 48px; }
.prose h3 { margin-top: 32px; }
.prose section[id] { scroll-margin-top: var(--anchor-offset); }
.muted { color: var(--muted); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.no-break { white-space: nowrap; }
.skip { position: absolute; left: -9999px; top: 8px; padding: 8px 14px; background: var(--panel); color: var(--text); border: 1.5px solid var(--text); border-radius: var(--r-btn); z-index: 100; text-decoration: none; }
.skip:focus { left: 16px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.panel,.card { min-width: 0; padding: 24px; background: var(--panel); border: 1px solid var(--border); border-radius: var(--r-card); box-shadow: var(--shadow-card); }
.panel-soft { background: var(--panel-2); border-radius: var(--r-board); padding: 32px; min-width: 0; }
.grid-three { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 24px; }
.grid-two { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 24px; }
.grid-three>*,.grid-two>* { min-width: 0; }
.badge,.chip { display: inline-flex; align-items: center; min-height: 28px; gap: 6px; max-width: 100%; padding: 4px 10px; border-radius: var(--r-pill); background: var(--panel-2); color: var(--accent-dark); font-size: 13px; font-weight: 600; overflow-wrap: anywhere; }
.badge-success { color: var(--success); background: var(--success-a16); }
.badge-warn { color: var(--text); border: 1px solid var(--warn); background: var(--panel); }
.badge-error { color: var(--error); border: 1px solid var(--error); background: var(--panel); }
.btn { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 12px 28px; border: 1.5px solid var(--clear); border-radius: var(--r-btn); font: 600 17px/1.4 var(--font-body); letter-spacing: .01em; text-decoration: none; transition: background-color var(--ease-ui),color var(--ease-ui),box-shadow var(--ease-ui); }
.btn-main,.btn-primary { background: var(--accent); color: var(--on-accent); box-shadow: inset 0 1px 0 var(--hi-glass),0 14px 28px -14px var(--accent-a40); }
.btn-main:hover,.btn-primary:hover,.btn-main.is-hover { background: var(--accent-dark); }
.btn-ghost,.btn-secondary { background: var(--panel); color: var(--text); border-color: var(--text); }
.btn-ghost:hover,.btn-secondary:hover { background: var(--panel-2); }
.btn:active,.btn.is-active { box-shadow: inset 0 2px 5px var(--ink-a20); }
.btn:disabled,.btn[aria-disabled="true"] { cursor: not-allowed; background: var(--panel-2); color: var(--muted); border-color: var(--border); box-shadow: none; }
.btn-small { min-height: 44px; padding: 8px 16px; font-size: 14px; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.ico-line { fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.site-head,#site-header { position: relative; z-index: 40; }
.bar { position: relative; display: flex; align-items: center; gap: 24px; min-height: var(--header-height); }
.brand { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; color: var(--text); flex-shrink: 0; }
.brand-mark { width: 32px; height: 32px; flex-shrink: 0; display: block; }
.brand-en { font-family: var(--font-display); font-weight: 800; font-size: 20px; letter-spacing: -.02em; line-height: 1; }
.brand-zh { font-size: 14px; font-weight: 500; color: var(--muted); padding-left: 10px; border-left: 1px solid var(--border); }
.menu { flex: 1; display: flex; justify-content: center; min-width: 0; }
.menu ul { display: flex; align-items: center; gap: 2px; list-style: none; margin: 0; padding: 0; }
.menu a { display: block; padding: 8px 14px; border-radius: var(--r-pill); color: var(--muted); font-size: 15px; font-weight: 500; text-decoration: none; white-space: nowrap; transition: color var(--ease-ui),background-color var(--ease-ui); }
.menu a:hover { color: var(--text); background: var(--accent-a05); }
.menu a[aria-current="page"],.nav-drawer a[aria-current="page"] { background: var(--panel-2); color: var(--accent-dark); font-weight: 600; box-shadow: inset 0 0 0 1px var(--accent-a10); }
.tools { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.language { position: relative; }
.lang { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 40px; min-width: 44px; width: auto; padding: 0 12px; border: 0; border-radius: var(--r-btn); background: var(--clear); color: var(--muted); font: 500 14px/1 var(--font-body); transition: color var(--ease-ui),background-color var(--ease-ui); }
.lang-text { white-space: nowrap; }
.lang:hover { color: var(--text); background: var(--accent-a05); }
.lang svg { width: 16px; height: 16px; }
.lang-panel { position: absolute; z-index: 60; right: 0; top: calc(100% + 8px); min-width: 180px; padding: 8px; border: 1px solid var(--border); border-radius: var(--r-card); background: var(--panel); box-shadow: var(--shadow-card); }
.lang-panel a { display: flex; align-items: center; min-height: 44px; padding: 8px 12px; text-decoration: none; border-radius: var(--r-btn); }
.lang-panel a:hover,.lang-panel a[aria-current="true"] { background: var(--panel-2); color: var(--accent-dark); }
.login { display: inline-flex; align-items: center; justify-content: center; min-height: 40px; padding: 8px 20px; border: 1.5px solid var(--text); border-radius: var(--r-btn); background: var(--panel); color: var(--text); font-size: 15px; font-weight: 600; text-decoration: none; white-space: nowrap; transition: background-color var(--ease-ui),color var(--ease-ui); }
.login:hover { background: var(--text); color: var(--panel); }
.burger { display: none; flex-direction: column; align-items: center; justify-content: center; gap: 4px; min-width: 44px; min-height: 44px; border: 1px solid var(--border); border-radius: var(--r-btn); color: var(--text); background: var(--panel); }
.burger-line { display: block; width: 20px; height: 2px; background: currentColor; }
.burger[aria-expanded="true"] { background: var(--panel-2); border-color: var(--accent); }
.nav-drawer { display: none; }
.nav-veil { display: none; }
.drawer-languages { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--border); }
html.nav-open { overflow: hidden; }
.site-footer { margin-top: 48px; padding-top: 56px; padding-bottom: 24px; background: var(--panel); border-top: 1px solid var(--border); box-shadow: inset 0 1px 0 var(--hi); }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; }
.footer-grid>* { min-width: 0; }
.footer-intro { margin: 20px 0 0; color: var(--muted); max-width: 28em; }
.footer-heading { margin: 0 0 16px; font-size: 15px; font-weight: 700; }
.footer-links { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.footer-links a { display: inline-flex; align-items: center; min-height: 28px; text-decoration: none; color: var(--muted); overflow-wrap: anywhere; }
.footer-links a:hover { color: var(--accent-dark); }
.footer-bottom { margin-top: 40px; padding-top: 24px; border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 16px; font-size: 13px; color: var(--muted); }
.footer-legal { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-legal a { display: inline-flex; align-items: center; min-height: 28px; }
.reveal { transition: opacity var(--reveal-time),transform var(--reveal-time); }
.reveal.pending { opacity: 0; transform: translateY(16px); }
.reveal.shown { opacity: 1; transform: none; }
#server-status { position: static; display: flow-root; min-width: 0; max-width: 100%; overflow: hidden; margin-top: 24px; margin-bottom: 24px; }
#server-status+* { margin-top: 24px; }
#server-status>* { min-width: 0; max-width: 100%; }
@media (max-width: 1240px) {
  .menu a { padding: 8px 10px; font-size: 14.5px; }
  .bar { gap: 16px; }
}
@media (max-width: 1100px) {
  .menu a { padding: 8px; font-size: 14px; }
  .lang-text { display: none; }
}
@media (max-width: 980px) {
  .menu { display: none; }
  .tools { margin-left: auto; }
  .bar { flex-wrap: nowrap; }
  .burger { display: inline-flex; }
  .nav-drawer { display: block; position: fixed; z-index: 43; top: var(--header-height); left: 0; right: 0; height: calc(100dvh - var(--header-height)); max-height: calc(100dvh - var(--header-height)); overflow-y: auto; overscroll-behavior: contain; padding: 16px var(--gutter) 32px; background: var(--panel); border-top: 1px solid var(--border); }
  .nav-drawer ul { list-style: none; margin: 0; padding: 0; }
  .nav-drawer a { display: flex; width: 100%; align-items: center; min-height: 48px; padding: 12px 16px; border-radius: var(--r-btn); text-decoration: none; }
  .nav-drawer a:hover { background: var(--panel-2); }
  .nav-veil { display: block; position: fixed; z-index: 41; inset: var(--header-height) 0 0; border: 0; padding: 0; background: var(--ink-a20); }
  .footer-grid { grid-template-columns: repeat(2,minmax(0,1fr)); }
}
@media (max-width: 768px) {
  :root { --gutter: 20px; }
  h1 { font-size: 40px; }
  h2 { font-size: 28px; }
  .section { padding-top: 48px; padding-bottom: 48px; }
  .grid-three,.grid-two { grid-template-columns: minmax(0,1fr); }
}
@media (max-width: 640px) {
  .no-break { white-space: normal; }
  .tilt,.rig-lift { transform: none; }
  [data-hero-visual],.decorated-section { max-width: 100%; overflow-x: clip; }
  .footer-grid { gap: 32px 20px; }
}
@media (max-width: 480px) {
  .bar { gap: 8px; }
  .brand { gap: 7px; }
  .brand-en { font-size: 18px; }
  .brand-mark { width: 28px; height: 28px; }
  .tools { gap: 4px; margin-left: auto; }
  .login { min-height: 44px; padding: 8px 12px; font-size: 14px; }
  .lang { min-height: 44px; padding: 0 8px; }
  .footer-grid { grid-template-columns: minmax(0,1fr); }
  .cta-row .btn { flex: 1 1 140px; }
}
@media (max-width: 360px) {
  :root { --gutter: 16px; }
  .bar { gap: 4px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,*::before,*::after { transition: none !important; animation: none !important; }
  .reveal,.reveal.pending,.reveal.shown { opacity: 1; transform: none; }
}